content: /*
   * 支付宝开放平台API
   * 支付宝开放平台v3协议文档
   *
   * The version of the OpenAPI document: 2025-08-26
   * 
   *
   * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
   * https://openapi-generator.tech
   * Do not edit the class manually.
   */
  
  
  package com.alipay.v3.model;
  
  import java.util.Objects;
  import java.util.Arrays;
  import com.alipay.v3.model.BillSendExtInfo;
  import com.alipay.v3.model.ChargeItems;
  import com.alipay.v3.model.UserDetails;
  import com.google.gson.TypeAdapter;
  import com.google.gson.annotations.JsonAdapter;
  import com.google.gson.annotations.SerializedName;
  import com.google.gson.stream.JsonReader;
  import com.google.gson.stream.JsonWriter;
  import io.swagger.annotations.ApiModel;
  import io.swagger.annotations.ApiModelProperty;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import com.google.gson.Gson;
  import com.google.gson.GsonBuilder;
  import com.google.gson.JsonArray;
  import com.google.gson.JsonDeserializationContext;
  import com.google.gson.JsonDeserializer;
  import com.google.gson.JsonElement;
  import com.google.gson.JsonObject;
  import com.google.gson.JsonParseException;
  import com.google.gson.TypeAdapterFactory;
  import com.google.gson.reflect.TypeToken;
  
  import java.lang.reflect.Type;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Set;
  
  import com.alipay.v3.JSON;
  
  /**
   * AlipayEcoEduKtBillingSendModel
   */
  @javax.annotation.Generated(value = "org.openapitools.codegen.languages.JavaClientCodegen")
  public class AlipayEcoEduKtBillingSendModel {
    public static final String SERIALIZED_NAME_AMOUNT = "amount";
    @SerializedName(SERIALIZED_NAME_AMOUNT)
    private String amount;
  
    public static final String SERIALIZED_NAME_CHARGE_BILL_TITLE = "charge_bill_title";
    @SerializedName(SERIALIZED_NAME_CHARGE_BILL_TITLE)
    private String chargeBillTitle;
  
    public static final String SERIALIZED_NAME_CHARGE_ITEM = "charge_item";
    @SerializedName(SERIALIZED_NAME_CHARGE_ITEM)
    private List<ChargeItems> chargeItem = null;
  
    public static final String SERIALIZED_NAME_CHARGE_TYPE = "charge_type";
    @SerializedName(SERIALIZED_NAME_CHARGE_TYPE)
    private String chargeType;
  
    public static final String SERIALIZED_NAME_CHILD_NAME = "child_name";
    @SerializedName(SERIALIZED_NAME_CHILD_NAME)
    private String childName;
  
    public static final String SERIALIZED_NAME_CLASS_IN = "class_in";
    @SerializedName(SERIALIZED_NAME_CLASS_IN)
    private String classIn;
  
    public static final String SERIALIZED_NAME_END_ENABLE = "end_enable";
    @SerializedName(SERIALIZED_NAME_END_ENABLE)
    private String endEnable;
  
    public static final String SERIALIZED_NAME_EXT_INFO = "ext_info";
    @SerializedName(SERIALIZED_NAME_EXT_INFO)
    private BillSendExtInfo extInfo;
  
    public static final String SERIALIZED_NAME_GMT_END = "gmt_end";
    @SerializedName(SERIALIZED_NAME_GMT_END)
    private String gmtEnd;
  
    public static final String SERIALIZED_NAME_GRADE = "grade";
    @SerializedName(SERIALIZED_NAME_GRADE)
    private String grade;
  
    public static final String SERIALIZED_NAME_OUT_TRADE_NO = "out_trade_no";
    @SerializedName(SERIALIZED_NAME_OUT_TRADE_NO)
    private String outTradeNo;
  
    public static final String SERIALIZED_NAME_PARTNER_ID = "partner_id";
    @SerializedName(SERIALIZED_NAME_PARTNER_ID)
    private String partnerId;
  
    public static final String SERIALIZED_NAME_SCHOOL_NO = "school_no";
    @SerializedName(SERIALIZED_NAME_SCHOOL_NO)
    private String schoolNo;
  
    public static final String SERIALIZED_NAME_SCHOOL_PID = "school_pid";
    @SerializedName(SERIALIZED_NAME_SCHOOL_PID)
    private String schoolPid;
  
    public static final String SERIALIZED_NAME_STUDENT_CODE = "student_code";
    @SerializedName(SERIALIZED_NAME_STUDENT_CODE)
    private String studentCode;
  
    public static final String SERIALIZED_NAME_STUDENT_IDENTIFY = "student_identify";
    @SerializedName(SERIALIZED_NAME_STUDENT_IDENTIFY)
    private String studentIdentify;
  
    public static final String SERIALIZED_NAME_USERS = "users";
    @SerializedName(SERIALIZED_NAME_USERS)
    private List<UserDetails> users = null;
  
    public AlipayEcoEduKtBillingSendModel() { 
    }
  
    public AlipayEcoEduKtBillingSendModel amount(String amount) {
      
      this.amount = amount;
      return this;
    }
  
     /**
     * 总金额，单位为元，精确到小数点后两位，取值范围[0.01,100000000]，  如果是非多选项，是要和缴费项的总和相同，多选模式不做验证
     * @return amount
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "88.88", value = "总金额，单位为元，精确到小数点后两位，取值范围[0.01,100000000]，  如果是非多选项，是要和缴费项的总和相同，多选模式不做验证")
  
    public String getAmount() {
      return amount;
    }
  
  
    public void setAmount(String amount) {
      this.amount = amount;
    }
  
  
    public AlipayEcoEduKtBillingSendModel chargeBillTitle(String chargeBillTitle) {
      
      this.chargeBillTitle = chargeBillTitle;
      return this;
    }
  
     /**
     * 缴费账单名称
     * @return chargeBillTitle
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "学生开学收费项", value = "缴费账单名称")
  
    public String getChargeBillTitle() {
      return chargeBillTitle;
    }
  
  
    public void setChargeBillTitle(String chargeBillTitle) {
      this.chargeBillTitle = chargeBillTitle;
    }
  
  
    public AlipayEcoEduKtBillingSendModel chargeItem(List<ChargeItems> chargeItem) {
      
      this.chargeItem = chargeItem;
      return this;
    }
  
    public AlipayEcoEduKtBillingSendModel addChargeItemItem(ChargeItems chargeItemItem) {
      if (this.chargeItem == null) {
        this.chargeItem = new ArrayList<>();
      }
      this.chargeItem.add(chargeItemItem);
      return this;
    }
  
     /**
     * 缴费详情：输入json格式字符串。Json定义：key填写缴费项名称，value填写缴费项金额，金额保留2位小数（单位：元）
     * @return chargeItem
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(value = "缴费详情：输入json格式字符串。Json定义：key填写缴费项名称，value填写缴费项金额，金额保留2位小数（单位：元）")
  
    public List<ChargeItems> getChargeItem() {
      return chargeItem;
    }
  
  
    public void setChargeItem(List<ChargeItems> chargeItem) {
      this.chargeItem = chargeItem;
    }
  
  
    public AlipayEcoEduKtBillingSendModel chargeType(String chargeType) {
      
      this.chargeType = chargeType;
      return this;
    }
  
     /**
     * 缴费项模式：空或\&quot;N\&quot;，表示缴费项不可选，  \&quot;M\&quot;表示缴费项为可选 ，支持单选和多选。
     * @return chargeType
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "M", value = "缴费项模式：空或\"N\"，表示缴费项不可选，  \"M\"表示缴费项为可选 ，支持单选和多选。")
  
    public String getChargeType() {
      return chargeType;
    }
  
  
    public void setChargeType(String chargeType) {
      this.chargeType = chargeType;
    }
  
  
    public AlipayEcoEduKtBillingSendModel childName(String childName) {
      
      this.childName = childName;
      return this;
    }
  
     /**
     * 孩子名字
     * @return childName
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "张晓晓", value = "孩子名字")
  
    public String getChildName() {
      return childName;
    }
  
  
    public void setChildName(String childName) {
      this.childName = childName;
    }
  
  
    public AlipayEcoEduKtBillingSendModel classIn(String classIn) {
      
      this.classIn = classIn;
      return this;
    }
  
     /**
     * 孩子所在班级
     * @return classIn
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "3班", value = "孩子所在班级")
  
    public String getClassIn() {
      return classIn;
    }
  
  
    public void setClassIn(String classIn) {
      this.classIn = classIn;
    }
  
  
    public AlipayEcoEduKtBillingSendModel endEnable(String endEnable) {
      
      this.endEnable = endEnable;
      return this;
    }
  
     /**
     * 截止日期是否生效，与gmt_end发布配合使用,N为gmt_end不生效，用户过期后仍可以缴费；Y为gmt_end生效，用户过期后，不能再缴费。
     * @return endEnable
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "Y", value = "截止日期是否生效，与gmt_end发布配合使用,N为gmt_end不生效，用户过期后仍可以缴费；Y为gmt_end生效，用户过期后，不能再缴费。")
  
    public String getEndEnable() {
      return endEnable;
    }
  
  
    public void setEndEnable(String endEnable) {
      this.endEnable = endEnable;
    }
  
  
    public AlipayEcoEduKtBillingSendModel extInfo(BillSendExtInfo extInfo) {
      
      this.extInfo = extInfo;
      return this;
    }
  
     /**
     * Get extInfo
     * @return extInfo
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(value = "")
  
    public BillSendExtInfo getExtInfo() {
      return extInfo;
    }
  
  
    public void setExtInfo(BillSendExtInfo extInfo) {
      this.extInfo = extInfo;
    }
  
  
    public AlipayEcoEduKtBillingSendModel gmtEnd(String gmtEnd) {
      
      this.gmtEnd = gmtEnd;
      return this;
    }
  
     /**
     * 缴费截止时间，格式\&quot;yyyy-MM-dd HH:mm:ss\&quot;，日期要大于当前时间。请注意，过期时间不宜设置过短。
     * @return gmtEnd
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "2016-01-01 13:13:13", value = "缴费截止时间，格式\"yyyy-MM-dd HH:mm:ss\"，日期要大于当前时间。请注意，过期时间不宜设置过短。")
  
    public String getGmtEnd() {
      return gmtEnd;
    }
  
  
    public void setGmtEnd(String gmtEnd) {
      this.gmtEnd = gmtEnd;
    }
  
  
    public AlipayEcoEduKtBillingSendModel grade(String grade) {
      
      this.grade = grade;
      return this;
    }
  
     /**
     * 孩子所在年级
     * @return grade
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "高一", value = "孩子所在年级")
  
    public String getGrade() {
      return grade;
    }
  
  
    public void setGrade(String grade) {
      this.grade = grade;
    }
  
  
    public AlipayEcoEduKtBillingSendModel outTradeNo(String outTradeNo) {
      
      this.outTradeNo = outTradeNo;
      return this;
    }
  
     /**
     * ISV端的缴费账单编号
     * @return outTradeNo
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "20160232343253253453", value = "ISV端的缴费账单编号")
  
    public String getOutTradeNo() {
      return outTradeNo;
    }
  
  
    public void setOutTradeNo(String outTradeNo) {
      this.outTradeNo = outTradeNo;
    }
  
  
    public AlipayEcoEduKtBillingSendModel partnerId(String partnerId) {
      
      this.partnerId = partnerId;
      return this;
    }
  
     /**
     * Isv支付宝pid, 支付宝签约后，返回给ISV编号
     * @return partnerId
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "201600129391238873", value = "Isv支付宝pid, 支付宝签约后，返回给ISV编号")
  
    public String getPartnerId() {
      return partnerId;
    }
  
  
    public void setPartnerId(String partnerId) {
      this.partnerId = partnerId;
    }
  
  
    public AlipayEcoEduKtBillingSendModel schoolNo(String schoolNo) {
      
      this.schoolNo = schoolNo;
      return this;
    }
  
     /**
     * 学校编码，录入学校接口返回的参数
     * @return schoolNo
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "11010100000002", value = "学校编码，录入学校接口返回的参数")
  
    public String getSchoolNo() {
      return schoolNo;
    }
  
  
    public void setSchoolNo(String schoolNo) {
      this.schoolNo = schoolNo;
    }
  
  
    public AlipayEcoEduKtBillingSendModel schoolPid(String schoolPid) {
      
      this.schoolPid = schoolPid;
      return this;
    }
  
     /**
     * 学校支付宝pid,直付通填写smid
     * @return schoolPid
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "20880012939123234423", value = "学校支付宝pid,直付通填写smid")
  
    public String getSchoolPid() {
      return schoolPid;
    }
  
  
    public void setSchoolPid(String schoolPid) {
      this.schoolPid = schoolPid;
    }
  
  
    public AlipayEcoEduKtBillingSendModel studentCode(String studentCode) {
      
      this.studentCode = studentCode;
      return this;
    }
  
     /**
     * 学生的学号，只支持字母和数字类型，一般以教育局学号为准，作为学生的唯一标识。此字段与student_identify、家长user_mobile至少选一个
     * @return studentCode
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "2098453900091", value = "学生的学号，只支持字母和数字类型，一般以教育局学号为准，作为学生的唯一标识。此字段与student_identify、家长user_mobile至少选一个")
  
    public String getStudentCode() {
      return studentCode;
    }
  
  
    public void setStudentCode(String studentCode) {
      this.studentCode = studentCode;
    }
  
  
    public AlipayEcoEduKtBillingSendModel studentIdentify(String studentIdentify) {
      
      this.studentIdentify = studentIdentify;
      return this;
    }
  
     /**
     * 学生的身份证号，如果ISV有学生身份证号，则同步身份证号作为学生唯一标识。此字段与student_code、家长user_mobile至少选一个。  大陆身份证必须是18位 ， 其它地区或国家的身份证开头需要加\&quot;IC\&quot;开头区分并且不超过18位，但查询账单的时候不要带\&quot;IC\&quot;
     * @return studentIdentify
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(example = "310193199905289483", value = "学生的身份证号，如果ISV有学生身份证号，则同步身份证号作为学生唯一标识。此字段与student_code、家长user_mobile至少选一个。  大陆身份证必须是18位 ， 其它地区或国家的身份证开头需要加\"IC\"开头区分并且不超过18位，但查询账单的时候不要带\"IC\"")
  
    public String getStudentIdentify() {
      return studentIdentify;
    }
  
  
    public void setStudentIdentify(String studentIdentify) {
      this.studentIdentify = studentIdentify;
    }
  
  
    public AlipayEcoEduKtBillingSendModel users(List<UserDetails> users) {
      
      this.users = users;
      return this;
    }
  
    public AlipayEcoEduKtBillingSendModel addUsersItem(UserDetails usersItem) {
      if (this.users == null) {
        this.users = new ArrayList<>();
      }
      this.users.add(usersItem);
      return this;
    }
  
     /**
     * 孩子的家长信息，最多一次输入10个家长，此字段做为识别家长的孩子用，与student_identify、student_code至少选一个
     * @return users
    **/
    @javax.annotation.Nullable
    @ApiModelProperty(value = "孩子的家长信息，最多一次输入10个家长，此字段做为识别家长的孩子用，与student_identify、student_code至少选一个")
  
    public List<UserDetails> getUsers() {
      return users;
    }
  
  
    public void setUsers(List<UserDetails> users) {
      this.users = users;
    }
  
    /**
     * A container for additional, undeclared properties.
     * This is a holder for any undeclared properties as specified with
     * the 'additionalProperties' keyword in the OAS document.
     */
    private Map<String, Object> additionalProperties;
  
    /**
     * Set the additional (undeclared) property with the specified name and value.
     * If the property does not already exist, create it otherwise replace it.
     *
     * @param key name of the property
     * @param value value of the property
     * @return the AlipayEcoEduKtBillingSendModel instance itself
     */
    public AlipayEcoEduKtBillingSendModel putAdditionalProperty(String key, Object value) {
      if (this.additionalProperties == null) {
          this.additionalProperties = new HashMap<String, Object>();
      }
      this.additionalProperties.put(key, value);
      return this;
    }
  
    /**
     * Return the additional (undeclared) property.
     *
     * @return a map of objects
     */
    public Map<String, Object> getAdditionalProperties() {
      return additionalProperties;
    }
  
    /**
     * Return the additional (undeclared) property with the specified name.
     *
     * @param key name of the property
     * @return an object
     */
    public Object getAdditionalProperty(String key) {
      if (this.additionalProperties == null) {
          return null;
      }
      return this.additionalProperties.get(key);
    }
  
  
    @Override
    public boolean equals(Object o) {
      if (this == o) {
        return true;
      }
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      AlipayEcoEduKtBillingSendModel alipayEcoEduKtBillingSendModel = (AlipayEcoEduKtBillingSendModel) o;
      return Objects.equals(this.amount, alipayEcoEduKtBillingSendModel.amount) &&
          Objects.equals(this.chargeBillTitle, alipayEcoEduKtBillingSendModel.chargeBillTitle) &&
          Objects.equals(this.chargeItem, alipayEcoEduKtBillingSendModel.chargeItem) &&
          Objects.equals(this.chargeType, alipayEcoEduKtBillingSendModel.chargeType) &&
          Objects.equals(this.childName, alipayEcoEduKtBillingSendModel.childName) &&
          Objects.equals(this.classIn, alipayEcoEduKtBillingSendModel.classIn) &&
          Objects.equals(this.endEnable, alipayEcoEduKtBillingSendModel.endEnable) &&
          Objects.equals(this.extInfo, alipayEcoEduKtBillingSendModel.extInfo) &&
          Objects.equals(this.gmtEnd, alipayEcoEduKtBillingSendModel.gmtEnd) &&
          Objects.equals(this.grade, alipayEcoEduKtBillingSendModel.grade) &&
          Objects.equals(this.outTradeNo, alipayEcoEduKtBillingSendModel.outTradeNo) &&
          Objects.equals(this.partnerId, alipayEcoEduKtBillingSendModel.partnerId) &&
          Objects.equals(this.schoolNo, alipayEcoEduKtBillingSendModel.schoolNo) &&
          Objects.equals(this.schoolPid, alipayEcoEduKtBillingSendModel.schoolPid) &&
          Objects.equals(this.studentCode, alipayEcoEduKtBillingSendModel.studentCode) &&
          Objects.equals(this.studentIdentify, alipayEcoEduKtBillingSendModel.studentIdentify) &&
          Objects.equals(this.users, alipayEcoEduKtBillingSendModel.users)&&
          Objects.equals(this.additionalProperties, alipayEcoEduKtBillingSendModel.additionalProperties);
    }
  
    @Override
    public int hashCode() {
      return Objects.hash(amount, chargeBillTitle, chargeItem, chargeType, childName, classIn, endEnable, extInfo, gmtEnd, grade, outTradeNo, partnerId, schoolNo, schoolPid, studentCode, studentIdentify, users, additionalProperties);
    }
  
    @Override
    public String toString() {
      StringBuilder sb = new StringBuilder();
      sb.append("class AlipayEcoEduKtBillingSendModel {\n");
      sb.append("    amount: ").append(toIndentedString(amount)).append("\n");
      sb.append("    chargeBillTitle: ").append(toIndentedString(chargeBillTitle)).append("\n");
      sb.append("    chargeItem: ").append(toIndentedString(chargeItem)).append("\n");
      sb.append("    chargeType: ").append(toIndentedString(chargeType)).append("\n");
      sb.append("    childName: ").append(toIndentedString(childName)).append("\n");
      sb.append("    classIn: ").append(toIndentedString(classIn)).append("\n");
      sb.append("    endEnable: ").append(toIndentedString(endEnable)).append("\n");
      sb.append("    extInfo: ").append(toIndentedString(extInfo)).append("\n");
      sb.append("    gmtEnd: ").append(toIndentedString(gmtEnd)).append("\n");
      sb.append("    grade: ").append(toIndentedString(grade)).append("\n");
      sb.append("    outTradeNo: ").append(toIndentedString(outTradeNo)).append("\n");
      sb.append("    partnerId: ").append(toIndentedString(partnerId)).append("\n");
      sb.append("    schoolNo: ").append(toIndentedString(schoolNo)).append("\n");
      sb.append("    schoolPid: ").append(toIndentedString(schoolPid)).append("\n");
      sb.append("    studentCode: ").append(toIndentedString(studentCode)).append("\n");
      sb.append("    studentIdentify: ").append(toIndentedString(studentIdentify)).append("\n");
      sb.append("    users: ").append(toIndentedString(users)).append("\n");
      sb.append("    additionalProperties: ").append(toIndentedString(additionalProperties)).append("\n");
      sb.append("}");
      return sb.toString();
    }
  
    /**
     * Convert the given object to string with each line indented by 4 spaces
     * (except the first line).
     */
    private String toIndentedString(Object o) {
      if (o == null) {
        return "null";
      }
      return o.toString().replace("\n", "\n    ");
    }
  
  
    public static HashSet<String> openapiFields;
    public static HashSet<String> openapiRequiredFields;
  
    static {
      // a set of all properties/fields (JSON key names)
      openapiFields = new HashSet<String>();
      openapiFields.add("amount");
      openapiFields.add("charge_bill_title");
      openapiFields.add("charge_item");
      openapiFields.add("charge_type");
      openapiFields.add("child_name");
      openapiFields.add("class_in");
      openapiFields.add("end_enable");
      openapiFields.add("ext_info");
      openapiFields.add("gmt_end");
      openapiFields.add("grade");
      openapiFields.add("out_trade_no");
      openapiFields.add("partner_id");
      openapiFields.add("school_no");
      openapiFields.add("school_pid");
      openapiFields.add("student_code");
      openapiFields.add("student_identify");
      openapiFields.add("users");
  
      // a set of required properties/fields (JSON key names)
      openapiRequiredFields = new HashSet<String>();
    }
  
   /**
    * Validates the JSON Object and throws an exception if issues found
    *
    * @param jsonObj JSON Object
    * @throws IOException if the JSON Object is invalid with respect to AlipayEcoEduKtBillingSendModel
    */
    public static void validateJsonObject(JsonObject jsonObj) throws IOException {
        if (jsonObj == null) {
          if (AlipayEcoEduKtBillingSendModel.openapiRequiredFields.isEmpty()) {
            return;
          } else { // has required fields
            throw new IllegalArgumentException(String.format("The required field(s) %s in AlipayEcoEduKtBillingSendModel is not found in the empty JSON string", AlipayEcoEduKtBillingSendModel.openapiRequiredFields.toString()));
          }
        }
        if (jsonObj.get("amount") != null && !jsonObj.get("amount").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `amount` to be a primitive type in the JSON string but got `%s`", jsonObj.get("amount").toString()));
        }
        if (jsonObj.get("charge_bill_title") != null && !jsonObj.get("charge_bill_title").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `charge_bill_title` to be a primitive type in the JSON string but got `%s`", jsonObj.get("charge_bill_title").toString()));
        }
        JsonArray jsonArraychargeItem = jsonObj.getAsJsonArray("charge_item");
        if (jsonArraychargeItem != null) {
          // ensure the json data is an array
          if (!jsonObj.get("charge_item").isJsonArray()) {
            throw new IllegalArgumentException(String.format("Expected the field `charge_item` to be an array in the JSON string but got `%s`", jsonObj.get("charge_item").toString()));
          }
  
          // validate the optional field `charge_item` (array)
          for (int i = 0; i < jsonArraychargeItem.size(); i++) {
            ChargeItems.validateJsonObject(jsonArraychargeItem.get(i).getAsJsonObject());
          };
        }
        if (jsonObj.get("charge_type") != null && !jsonObj.get("charge_type").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `charge_type` to be a primitive type in the JSON string but got `%s`", jsonObj.get("charge_type").toString()));
        }
        if (jsonObj.get("child_name") != null && !jsonObj.get("child_name").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `child_name` to be a primitive type in the JSON string but got `%s`", jsonObj.get("child_name").toString()));
        }
        if (jsonObj.get("class_in") != null && !jsonObj.get("class_in").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `class_in` to be a primitive type in the JSON string but got `%s`", jsonObj.get("class_in").toString()));
        }
        if (jsonObj.get("end_enable") != null && !jsonObj.get("end_enable").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `end_enable` to be a primitive type in the JSON string but got `%s`", jsonObj.get("end_enable").toString()));
        }
        // validate the optional field `ext_info`
        if (jsonObj.getAsJsonObject("ext_info") != null) {
          BillSendExtInfo.validateJsonObject(jsonObj.getAsJsonObject("ext_info"));
        }
        if (jsonObj.get("gmt_end") != null && !jsonObj.get("gmt_end").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `gmt_end` to be a primitive type in the JSON string but got `%s`", jsonObj.get("gmt_end").toString()));
        }
        if (jsonObj.get("grade") != null && !jsonObj.get("grade").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `grade` to be a primitive type in the JSON string but got `%s`", jsonObj.get("grade").toString()));
        }
        if (jsonObj.get("out_trade_no") != null && !jsonObj.get("out_trade_no").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `out_trade_no` to be a primitive type in the JSON string but got `%s`", jsonObj.get("out_trade_no").toString()));
        }
        if (jsonObj.get("partner_id") != null && !jsonObj.get("partner_id").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `partner_id` to be a primitive type in the JSON string but got `%s`", jsonObj.get("partner_id").toString()));
        }
        if (jsonObj.get("school_no") != null && !jsonObj.get("school_no").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `school_no` to be a primitive type in the JSON string but got `%s`", jsonObj.get("school_no").toString()));
        }
        if (jsonObj.get("school_pid") != null && !jsonObj.get("school_pid").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `school_pid` to be a primitive type in the JSON string but got `%s`", jsonObj.get("school_pid").toString()));
        }
        if (jsonObj.get("student_code") != null && !jsonObj.get("student_code").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `student_code` to be a primitive type in the JSON string but got `%s`", jsonObj.get("student_code").toString()));
        }
        if (jsonObj.get("student_identify") != null && !jsonObj.get("student_identify").isJsonPrimitive()) {
          throw new IllegalArgumentException(String.format("Expected the field `student_identify` to be a primitive type in the JSON string but got `%s`", jsonObj.get("student_identify").toString()));
        }
        JsonArray jsonArrayusers = jsonObj.getAsJsonArray("users");
        if (jsonArrayusers != null) {
          // ensure the json data is an array
          if (!jsonObj.get("users").isJsonArray()) {
            throw new IllegalArgumentException(String.format("Expected the field `users` to be an array in the JSON string but got `%s`", jsonObj.get("users").toString()));
          }
  
          // validate the optional field `users` (array)
          for (int i = 0; i < jsonArrayusers.size(); i++) {
            UserDetails.validateJsonObject(jsonArrayusers.get(i).getAsJsonObject());
          };
        }
    }
  
    public static class CustomTypeAdapterFactory implements TypeAdapterFactory {
      @SuppressWarnings("unchecked")
      @Override
      public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
         if (!AlipayEcoEduKtBillingSendModel.class.isAssignableFrom(type.getRawType())) {
           return null; // this class only serializes 'AlipayEcoEduKtBillingSendModel' and its subtypes
         }
         final TypeAdapter<JsonElement> elementAdapter = gson.getAdapter(JsonElement.class);
         final TypeAdapter<AlipayEcoEduKtBillingSendModel> thisAdapter
                          = gson.getDelegateAdapter(this, TypeToken.get(AlipayEcoEduKtBillingSendModel.class));
  
         return (TypeAdapter<T>) new TypeAdapter<AlipayEcoEduKtBillingSendModel>() {
             @Override
             public void write(JsonWriter out, AlipayEcoEduKtBillingSendModel value) throws IOException {
               JsonObject obj = thisAdapter.toJsonTree(value).getAsJsonObject();
               obj.remove("additionalProperties");
               // serialize additonal properties
               if (value.getAdditionalProperties() != null) {
                 for (Map.Entry<String, Object> entry : value.getAdditionalProperties().entrySet()) {
                   if (entry.getValue() instanceof String)
                     obj.addProperty(entry.getKey(), (String) entry.getValue());
                   else if (entry.getValue() instanceof Number)
                     obj.addProperty(entry.getKey(), (Number) entry.getValue());
                   else if (entry.getValue() instanceof Boolean)
                     obj.addProperty(entry.getKey(), (Boolean) entry.getValue());
                   else if (entry.getValue() instanceof Character)
                     obj.addProperty(entry.getKey(), (Character) entry.getValue());
                   else {
                     obj.add(entry.getKey(), gson.toJsonTree(entry.getValue()).getAsJsonObject());
                   }
                 }
               }
               elementAdapter.write(out, obj);
             }
  
             @Override
             public AlipayEcoEduKtBillingSendModel read(JsonReader in) throws IOException {
               JsonObject jsonObj = elementAdapter.read(in).getAsJsonObject();
               validateJsonObject(jsonObj);
               // store additional fields in the deserialized instance
               AlipayEcoEduKtBillingSendModel instance = thisAdapter.fromJsonTree(jsonObj);
               for (Map.Entry<String, JsonElement> entry : jsonObj.entrySet()) {
                 if (!openapiFields.contains(entry.getKey())) {
                   if (entry.getValue().isJsonPrimitive()) { // primitive type
                     if (entry.getValue().getAsJsonPrimitive().isString())
                       instance.putAdditionalProperty(entry.getKey(), entry.getValue().getAsString());
                     else if (entry.getValue().getAsJsonPrimitive().isNumber())
                       instance.putAdditionalProperty(entry.getKey(), entry.getValue().getAsNumber());
                     else if (entry.getValue().getAsJsonPrimitive().isBoolean())
                       instance.putAdditionalProperty(entry.getKey(), entry.getValue().getAsBoolean());
                     else
                       throw new IllegalArgumentException(String.format("The field `%s` has unknown primitive type. Value: %s", entry.getKey(), entry.getValue().toString()));
                   } else { // non-primitive type
                     instance.putAdditionalProperty(entry.getKey(), gson.fromJson(entry.getValue(), HashMap.class));
                   }
                 }
               }
               return instance;
             }
  
         }.nullSafe();
      }
    }
  
   /**
    * Create an instance of AlipayEcoEduKtBillingSendModel given an JSON string
    *
    * @param jsonString JSON string
    * @return An instance of AlipayEcoEduKtBillingSendModel
    * @throws IOException if the JSON string is invalid with respect to AlipayEcoEduKtBillingSendModel
    */
    public static AlipayEcoEduKtBillingSendModel fromJson(String jsonString) throws IOException {
      return JSON.getGson().fromJson(jsonString, AlipayEcoEduKtBillingSendModel.class);
    }
  
   /**
    * Convert an instance of AlipayEcoEduKtBillingSendModel to an JSON string
    *
    * @return JSON string
    */
    public String toJson() {
      return JSON.getGson().toJson(this);
    }
  }
  
  